Spring structure.



NJ. 891,873. YATENTED JUNE 30, 1908.

Y W. R. SMITH.

SPRING STRUUTUREP APPLICATION FILED MAY 2. 1907. RENEWED MAY 18, 1908.

2 SHEETS-SHEET 2.

WATSON R. SMETL, JACKSON, MICHTGAN, ASSIGIXOR TO VENTILATED CUSHION 8: SPRING COMPAN, OF CHICAGO, lLLiNOlS.

SE'RICNG STELTCTURE.

, Specification 01 Letters 4 No. SQLSI S, tent. Patent-ed June 30, 19087 Implication files}. Kiley :2, 19:32, No. 371,528. Renewed Eloy 13, 1908. Serial No. 433,594.

and also llllllfibl i for upholstered furnitureand n to provide an improved arrangement of the various parts of a cushion spring structure; to provide an improved arrangement of springs adapted to offer s ccr tain yi icing resistance to compression under normal conditions and to offer increased res'istan'ce at times wh n the Weight of the occupant is suddenly and violently shifted on account of the passage of the carriage over sudden rises or depressions in the road bed; and to provide an improved yielding'structure for the top frameof a cushion spring. These objects are accomplished by the de- Vice shown in the accompanying drawings, in which:

Figure 1 is a top plan of a cushion spring; constructed according to this invention, some of the ports of the springs which would be seen below being partly broken or omitted for the sake oi clear-moss of the illustration; .2 is a section on the line 2-2 of Fig. l Fig. 3 is a detail partly broken away of the bottom Frame of the structmc, the parts above being broken away; is similar plan. of the intermediate frame," Fig 5 is a detail of the metal clip which connects the bases of the springs which form the puris of the intermediate ironic shown in Fig. 4'; Fig. 6 is a detail of one of lhe joints of tho hot torn ironic; and Fig. 7 detail of another joint thereof.

In the constriu'rtion shown in the drawings, the structure comprises a top frame 5 and a bottom frame 6 separated by a plurality of liclicoidsl spiral springs T and an intermediiframc suspmuled l'rom Llic Wpcr frame by means oil" a plurality of helicoidslspirzil sprin s 8. The sprii'igs and S are urn ige il in pairs each spring 8 being disposed concenti'icz'ailly aromi'd one ol the springs 7 and huring convolutions of diameter mm the wolutions of said spring 7.

1e 6 is formed lr-y conncciing the mlutions of the springs 7 by means of at border wire 9, parallel stay-wires i0 and suitable metal clips securing said sorts together.

The stay-wires 10 are preferably connected to the spring 7 by means of sheet metal crossoers 11 split at each end into three tongues 12 and 13. The tongues are wrspped around the stay-wire 10 and the adjacent part of the spring 7, as illustrated in Fig. '7. The cars 14 are similar to the bars 1 lat their inner ends and are formed as illustinted in Fig. 6 at their outer ends. This is done so that the bottom frame 6 will be of the same size as the top frame for the sake of symmetry in the appearance of the cushion. The outer end or" the bar 14 is connected with he spring 7 by a separate ton us 15. Metal li 16 connect with the born or wire 9 such the springs 7 which are adjacent to it and not connected thereto by their cross-bars.

The intermediate frame 17 is formed by twisting the end of the lower convolution of e ch spring 8 about itself so as to form a sub.- stantially circular-base part for the sprin and then connecting the lower base of eac spring with those of the adjacent sprin s 8 and with a border wire 18 by means of c ips 19. These clips are referahly in the form liOVl Tl in Fig. 5 and t iey serve as links connecting the component parts of the intermediate frame 17 so that said parts may be capable oi yielding slightly to conform with the distribution of weight upon the cushion. This connection is, however, sufiicient to cause all of the springs to assist each other in supporting the load upon the cushion.

The upper end of each of the springs 8 is twisted about itself so that the upper convolution forms a complete substantially circular ring. The sheet metal liars 20 extending across the top of each pair of springs, connect the springs of such pair to each other and also connect the top of each pair of springs with the upper convolution of the spring 8 of the adjacent pair. The bars or crosspieces 20 of adjacent pairs of springs are disposed substantially at right angles to each other, as shown in Fig. 1, so that each pair of springs may yield somewhat with respect to adjacent pairs. The top convolution of each spring 7 is riveted at 21 to the middle of its bar 20. The ends of the bars 20 are into three longitudinal tongues as in the case of the bars 11 and said trmgues are wrapped arourul the bars which they consaid springs being nect in a somewhat similar manner. In the bottom frame. it is preferred that the stay-wires ltllie. in the same vertical plane with the adjacent parts of the base convolutions of the springs 7 while in the t op frame the connected parts he in the. same horizontal plane with each other. The border wire 22 of the top l'rame is connected to the adja cent springs by means oi clips 23% at such points where the cross-bars 20 of the adja cent springs do not themselves serve this purpose.

In. operation the bottom :trame rests upon a suitable support, such as, a iarriage or seat. The weight of the occupant under normal conditions is supported by the springs 7, of such strength as to yield readily through the shifting of the Weight of the occupant or through slight jotting of the vehicle. In case of severe jolts, the intermediate frame 17 comes into contact with the base frame 6 and the combined power of the springs '7 and o is exerted to resist compression.

that I claim as my invention and desire to secure by Letters Patent, is:

1. In a spring cushion, the pombination ot' a top frame, a bottom frame, a plurality oi spiral springs yieldingly connecting said top and bottom frames, a second set of spiral springs of less height. than those of th first set, each located substantialiy concentric with one of the springs of the first set and being of larger diameter so as to be normally tree from the adjacent convolutions of the corrcspondii'ig spring of the first set, one end 01' each of the springs in said second set being connected to one of said frames, and an intermediate l'rame supported by the other end of said second set of springs, said springs and frames being so disposed as to permit the top to be.

depressed a considcrab e distant-c without resistance by said second set. and to cause such resistance when the top is further (lepressed.

.2. A spring cushion comprising a. bottom frame, a top l'rame, a set ol' spiral springs extending between said frames, :1 second set of spiral springs of larger diameter than those of the first set and of less height, each ol said second set of springs being located conceni l l l t l ll trio-ally around the outside of one of the springs in the hrst set and having one end secured to one of said frames, the inner ends of the ditlcrent springs of said second set being so secured together as to permit their movement relatively of pther springs of said second set.

33. A spring cushion con'iprising a bottom frame, a top trame, a set ol" spiral springs extending between said frames, a second set of spiral springs of larger diameter than those of the first set and of less hei ht, each of said second set ol springs bein located concentrically around the outside oi one of the springs in the first set and having one end sccured to one of said frames, and metal clips connecting together the adjacent parts of the inner end convolutions of said second set of springs, and forming therewith a flexible lramo movable relatively of said top and bottom frames.

4. A spring cushion comprising a bottom frame, a top frame, a set of spiral springs ex tending between said frames, a second set of spiral springs of larger diameter than those of the tirst set and of less hei ht, each of said second set of springs being coated concentrically around the outside of one of the springs in the first set and having one end secured to one of said frames, the inner ends of said second. set being connected together by a lloat ing frame having movement toward and from each of the other frames 5. A spring cushion, comprising 'a top frame, a bottom frame, a set of spiral springs extending between said frames, a second set of spiral springs disposed, respectively, around and clear of the upper parts of the springs of said lirst set, and having their upper ends secured to said top l'rame, and clips connecting the lower ends of the springs of the second set with rorrespomling parts of adjacent springs of the same set, said second set of springs being of less height than said lirst set. V

Signed at Jackson, Michigan, this L3 day of April 1907.

WATSON R. SMITH.

Witnesses:

CLAUDE b. LARNED, ETHEL M. PnELAN. 

